Liza Roslyakova was taken to hospital with severe chemical poisoning. The doctors were powerless, and a day later she died. The examination showed that the girl was poisoned with a chlorine-containing poison. Loginov and Petrovskaya, starting an investigation, learn about a mysterious man with whom Lisa had frivolous correspondence on the Internet. They learned from relatives that the mysterious addressee not only addicted Lisa to cocaine, but also supplied her with drugs by mail.

Young journalist Nikolai Klimov was found in his own car with his throat cut. A ritual cross was found next to his body, and when inspecting the workplace, a leaflet with the address of the house near which his car was parked was found. By all indications, this murder resembles a sacrifice, and all traces lead to a popular sect.

Despite the witness protection program, someone cracked down on the Borisov couple. Denis's husband badly damaged the Tambov criminal group by testifying in court about their financial machinations. During a search in the apartment of the murdered, Loginov found a fragment of a photograph of an unknown man. It seems to investigators that the bandits have nothing to do with it. Raya, the daughter of the Borisovs, unexpectedly sheds light on this complex matter.